| 王攀，臧朝平.机匣螺栓连接分区域薄层单元建模方法[J].航空发动机,2019,45(2):7-12 |
| 机匣螺栓连接分区域薄层单元建模方法 |
| Modeling Method of Subarea Thin-layer Element for Casing Bolted Joints |
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| DOI： |
| 中文关键词: 机匣 螺栓预紧力 分区域薄层单元 赫兹接触理论 M-B 分形模型 |
| 英文关键词:casing bolt pre-tightening force subarea thin-layer element Hertz contact theory M-B fractal model |
| 基金项目: |
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| 中文摘要: |
| 机匣连接的螺栓预紧力大小对其动力学特性影响较大。为更准确反映其接触刚度随预紧力的变化情况，采用分区域薄
层单元方法代替螺栓连接部分，并基于螺栓连接超模型刚度理论、赫兹接触理论以及M-B 分形模型，推导出不同螺栓预紧力下分
区域薄层单元的弹性模量，模拟机匣连接部分的轴向接触刚度，给出螺栓连接机匣简化建模方法。并以1 个螺栓连接试验机匣为
例，对比在不同螺栓预紧力下机匣仿真频率与模态试验频率，最大误差仅为2.83%。结果表明：分区域薄层单元建模方法能够有效地
对不同预紧力下的螺栓连接机匣进行简化建模。 |
| 英文摘要: |
| The pre-tightening force of the casing bolted joints had a great influence on the dynamic characteristics of the bolt. In order
to reflect more accurately the change of contact stiffness with pre-tightening force,a thin-layer element method was used to replace the
bolted joints structure. Based on the stiffness theory of bolted joints supermodel,Hertz contact theory and M-B fractal model,the elastic
modulus of thin-layer element with different bolted pre-tightening force was derived. The axial contact stiffness of the casing joints part was
simulated,and the simplified modeling method of the bolted joints casing was given. Taking a bolted joints test casing as an example,the
maximum error was only 2.83%,compared with the simulation frequency and modal test frequency of the casing under different bolted pretightening
force. The results show that the modeling method of the thin-layer element can effectively simplify the modeling of bolted joints
casing under different pre-tightening forces. |
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